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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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South Africa
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Free State South Africa
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Vredefort Dome (1)
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metamorphic rocks
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metamorphic rocks
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mylonites
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pseudotachylite (1)
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minerals
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silicates
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framework silicates
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feldspar group (1)
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sheet silicates
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mica group
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biotite (1)
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Primary terms
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Africa
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Southern Africa
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South Africa
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Free State South Africa
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Vredefort Dome (1)
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earthquakes (1)
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faults (1)
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metamorphic rocks
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mylonites
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pseudotachylite (1)
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metamorphism (1)
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tectonics (1)
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The Triassic–Jurassic boundary event from an equatorial carbonate platform (Ghalilah Formation, United Arab Emirates)
Stable isotope chemostratigraphy in lacustrine strata of the Xiagou Formation, Gansu Province, NW China
Abstract Two sections from Early Cretaceous lacustrine strata of the Xiagou Formation from the Changma Basin in Gansu Province, China, are correlated based on their carbon isotopic compositions of bulk sedimentary organic matter and carbonate, as well as carbonate oxygen-isotopic compositions. The samples were collected from fossiliferous strata, which contain well-preserved Cretaceous bird remains. The sections are primarily correlated based on a two-step increase in δ 13 C org with an overall magnitude of c. 12.5‰. The stratigraphic variations in carbon isotopes within the two lacustrine sections are correlated with global carbon isotope variations C3–C7 based on marine carbon isotope records. This correlation places the Xiagou lacustrine strata in this locality within the early Aptian Stage, specifically, the Selli Equivalent, which is associated with Ocean Anoxic Event 1a.